參數(shù)資料
型號(hào)： MC68HC05L25PB
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP52
封裝： TQFP-52
文件頁數(shù)： 67/152頁
文件大?。?/td> 897K
代理商： MC68HC05L25PB
Functional Pin Description
MC68HC05L25 Data Sheet, Rev. 3.1
Freescale Semiconductor
21
1.5.4.1 Crystal or Ceramic Resonator
The circuit in Figure 1-4(a) shows a typical 2-pin oscillator circuit for an AT-cut, parallel, resonant crystal.
The crystal manufacturer’s recommendations should be followed, since the crystal parameters determine
the external component values required to provide maximum stability and reliable startup. The load
capacitance values used in the oscillator circuit design should include all stray capacitances. The crystal
and components should be mounted as close as possible to the pins for startup stabilization and to
minimize output distortion. An internal startup feedback resistor of ROF between OSC1 and OSC2 can be
selected as a mask option.
1.5.4.2 External Clock
An external clock from another CMOS-compatible device can be connected to the OSC1 input, with the
OSC2 output not connected, as shown in Figure 1-4(b). This configuration is possible regardless of the
oscillator setup.
1.5.5 XOSC1 and XOSC2
The XOSC1 and XOSC2 pins are the connections for the 2-pin on-chip oscillator. The XOSC1 and
XOSC2 pins can accept these sets of components:
1.
A crystal as shown in Figure 1-5(a)
2.
An external clock signal as shown in Figure 1-5(b)
Figure 1-5. Oscillator Connections
The frequency, fXOSC, of the oscillator or external clock source is divided by two to produce the internal
operating frequency, fOP, if selected by SYS1:SYS0 bits.
1.5.5.1 Crystal
The circuit in Figure 1-5(a) shows a typical 2-pin oscillator circuit for a 32.768-kHz “watch” crystal. The
crystal manufacturer’s recommendations should be followed, since the crystal parameters determine the
external component values required to provide maximum stability and reliable startup. The load
capacitance values used in the oscillator circuit design should include all stray capacitances. The crystal
and components should be mounted as close as possible to the pins for start-up stabilization and to
(a) Crystal Connections
(b) External Clock
Source Connection
MASK OPTION
MCU
R
XOF
R
XOD
XOSC1
XOSC2
32.768 kHz (TYP)
CXO1
CXO2
XOSC1
XOSC2
MCU
UNCONNECTED
EXTERNAL CLOCK
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